メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((124.0750000 24.4500000, 124.0812500 24.4500000, 124.0812500 24.4541667, 124.0750000 24.4541667, 124.0750000 24.4500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral